Southeast Anatolia in Turkey is a region where important centres of early Christianity could be found. In Gaziantep, which was named “Little Bukhara” during the reign of Egyptian Mamluks, many Armenian churches have been documented. However, most of them have been destroyed or used for different purposes. The paper is dedicated to the study of three Armenian churches in Gaziantep where Armenians lived until the early 20th century. The history, the plan and frontal structures, ornaments of these churches are presented for the first time.